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LOS ANGELES (CBS) — A judge has postponed the involuntary manslaughter trial of Conrad Murray until Wednesday to give defense attorneys time to analyze new tests recently conducted by officials with the Los Angeles County Coroner’s office.

The tests analyzed the level of a sedative found in Michael Jackson’s system at the time of his death.

The defense suggests that authorities ignored the effects the drug may have had on the pop star and that their own tests show Jackson had taken eight pills before his death on June 25, 2009.

The trial was also delayed Monday because the father of one of the witnesses died over the weekend.

Dr. Steven Shafer, an anesthesiology expert, had been scheduled to testify Monday.

Prosecutors say his testimony is crucial in proving that Murray’s negligence led to Jackson’s death.

The trial was recessed Thursday afternoon because Shafer had been scheduled to attend a medical conference.

He reportedly never made it to the event because of his father’s death.